## mathstoopidz 4 years ago 2x+7y=-3 -9x+y=46

1. satellite73

too many equal signs

2. satellite73

oh my fault i see \[2x+7y=-3\] \[-9x+y=46\] sorry

3. satellite73

you want elimination or substitution ?

4. mathstoopidz

Substitution

5. satellite73

then solve second equation for y, because it is easiest \[-9x+y=46\] \[y=9x+46\] and substitute into first equation

6. Alexis1994_13

2x+7y=-3 (*9) -----> 18x+63y=-27 -9x+y=46 (*2) -----> -18x+2y=92 <=> 65y=65 <=>y=1

7. Alexis1994_13

2x+7*1=-3 => 2x=-10 => x=-5

8. Alexis1994_13

You are welcome :p

9. satellite73

\[2x+7y=-3\] \[2x+7(9x+46)=-3\] \[65x+322=-3\] \[65x=-325\] \[x=-5\]

10. satellite73

the find y by substitution. Alexis got right answer using elimination. doesn't matter which you use

11. Alexis1994_13

We are both great ^^

12. mathstoopidz

Yes, You both are. I just wish I could understand this better... still confused :/

13. mathstoopidz

what would an ordered pair be?

14. Alexis1994_13

Just write what I am writing and if you still have any questions tell me.